×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

(OP)
Vanadium(V) with Niobium(Nb) is usually used to have fine grane and solubilization properties on carbon steel. The common limit used for both is 0,15%. I need to be compliant with a specification that limits the Vanadium content belove 0,05% while a Vendor offer me a Carbon steel ASTM A 333 Gr.6 with Vanadium at 0.07%. Is that acceptable for a low temperature carbon steel. Why the specification asking for such low limit?

RE: MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

(OP)
P.S. Sorry for the missing information. The material shall be also NACE compliant (Sour Service application).

RE: MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

End user specification restrictions are usually aimed at achieving good weldability such that issues with installation contractors do not arise. Even more so when weld zone hardness maxima will apply as in ISO 15156-2.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

RE: MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

(OP)
For my experience since the thickness to weld is 12.7mm, welding I think is not critical. Moreover Vanadium below 0.15% is not an issue for welding execution as far as I know. Vanadium give fine grane, solubilization and also beneficial effects on thoughness. I have seen also that on ASTM A 333 there is not maximum limit for Vanadium content, so I think that is not considered critical far that material. If anyone has other experiences with that material let me know. Thanks!

RE: MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

If that is your view, try putting it to the owner of the specification and see if they concur.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04
 

RE: MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

Notch toughness acceptance is the main concern with this material, especially after PWHT, and so is meeting the minimum tensile strength. ASME SA 333 Grade 6 provides no stated maximum value for vanadium or other microalloy additions. This means the Purchaser can set maximum limits for these other alloy additions to ensure meeting strength and notch toughness requirements.  

Since vanadium is a potent strengthener and will affect low temperature notch toughness behavior, the Purchaser is purposely limiting this content and other microalloy additions. Grain refinement is provided by aluminum, per specification.
 

RE: MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

If the 333-6 has not also been made to fine grain practice through additions of Aluiminum, notch toughness in the HAZ, when subject to PWHT, will be adversely affected.

RE: MAXIMUM VANADIUM CONTENT IN ASTM A333 Gr.6

In addition to Stanweld's point, my only potential concern is stress relief cracking in situations of high residual stress and/or restraint.  Thicker sections (>>12.7mm) are at greatest risk.  

This could be a case of the specification writer trying to anticipate every potential metallurgical issue by writing such a tight specification that he shrinks the cost/availability window.   

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources